const std = @import("std");
pub fn main() !void {
    std.debug.print("hello world", .{});
    const o = std.io.getStdOut().writer();
    try o.print("hello {s}\n", .{"world"});
    for (1..10) |i| {
        for (1..i + 1) |j| {
            std.debug.print("{}*{}={}  ", .{ i, j, i * j });
        }
        std.debug.print("\n", .{});
    }
}
